docs(CHANGELOG): Update changelog for version 0.8.1

4 jobs for master in 1 minute and 9 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed pytest_3.6 #1231938

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passed pytest_3.7 #1231937

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passed pytest_3.8 #1231936

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passed pytest_latest #1231935

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